Paul:

After reading some of your emails concerning home-brewed engine management
systems, I started thinking that it might be fun to create an entire glass
panel for an aircraft.



Since I am always "reinventing the wheel", I began wondering if
acoustical  airspeed instruments are ever used on aircraft.
Two transducers oriented longitudinally in the air stream
should be able to use the Doppler Effect to easily calculate airspeed.
Heterodyne the upstream signal against the downstream signal.
Airspeed should be a multiple of the beat-frequency.

Robin

Why when a pressure sensor is $10? :)

Paul Lamar


Because builders of LSAs are always trying to save a few grams of weight
Pitot tubes and such might weigh more than a couple of small chips
??? Maybe

R